Objective: The worlds greatest resources of platinum-group elements, Cr and V are found in almost monomineralic, metre-scale, layers of Cr- and Fe-Ti oxides that formed during solidification of large bodies of basaltic magma trapped in the Earths crust (i.

The former, having annelaed under high temperature, are commonly refered to as the mantle (tectonized) peridotites, while the latter are considered to have crystallized as comulates from a basaltic magma in the ophiolite magma chamber.

A standard phase diagram of a basaltic magma (X) undergoing olivine-enstatite fractionation shows that the magma composition in each chamber will be driven down the olivine-enstatitc reaction curve (Fig.

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